Yarn clamp for knitting machines



Jan,

.J. G. CARLSON YARN CLAMP FOR KNITTING MACHI-NES 'Filed N I 11, 1922 M [in HM i U I 21 5 f 1 49 J. 7

jg V 14 Patented Jan. 13, 1925.

UNITED STATES PATENT OFFICE.

JOHAN G. CARLSON, OF ROCKFORD, ILLINOIS, ASSIGNOR TO BURSON KNITTING COM- PANY, OF ROCKFORD, ILLINOIS, A GORYORATION OF ILLINOIS.

YARN CLAMP FOR KNITTING MACHINES.

Application filed November 11, 1922. Serial No. 600,435.

To all whom it may concern:

Be it known that I, J OI-IAN G. CARLsoN, a citizen of the United States, residing at Rockford, in the county of IVinnebago and State of Illinois, have invented certain new and useful Improvements in Yarn Clamps for Knitting Machines, of which the following is a specification.

This invention relates to fiat bed knitting machines, and is an improvement on Patent No. 928,244, W. W. Burson,-July 20, 1909. This patent provides a means for holding the yarns at a transfer point or between the end of one stocking and the commencement of another, and further provides for automatically trimming certain yarns in the stocking or other knitted article duringv the process of knitting, thereby saving the expense of trimming by hand, also the liability of puckering the fabric by drawing the uncut yarn when a transfer of yarns occurs.

- Said invention eliminates breaks and other flaws in the fabric caused by said method of trimming by hand, and enables a considerable saving of yarn and labor.

The primary object of the present invention is to provide an improved yarn clamping or holding means atathe point of yarn transfer, characterized by yarn-clamping members which may be quickly and easily set into the machine or removed, thereby facilitating assembling and enabling quick removal of the clamping members for inspection, repair or replacement.

5 Referring to the drawings,

Figure 1 is a fragmentary top view of the yarn transfer end of a flat bed knitting machine of the Burson type, embodying-my invention;

Fig. 2 is an enlarged cross-sectional view through the needle beds taken substantially on the line 22 of Fig. 1;

Fig. 3 is a still greater enlargement showing in detail the yarn clamping members 46 and holding needles;

Fig. 4 is a top view of the parts shown in Fig. 3; and

Fig. 5 is a. perspective View of one of the clamping members removed from the machine.

Reference may be had to the above-mentionegl patent for an understanding of the joint action of the trimming cutters andthe yam-holding means. Inasmuch as the present invention relates to the yarn holding or clamping means, only these and whatever co-operating parts are necessary for an understanding of the invention, have been shown in the drawing.

The cross section in Fig. 2 shows the bottom plates 7 and 8 of the two needle beds, on which plates the needles are supported for reciprocation. In this figure is also shown the presser hook sectors 9, which have grooves 11, as shown in Figs. 3 and 1, for the reception of the presser hooks (not shown). The presser hook camsv 12 and guide bars 13 and 14 are also shown, the

latter overlying the presser hook sectors and closing the top of the grooves 11.

In Fig. 1 is shown a yarn carrier 15 adapted to be traversed lengthwise of the needle beds by the driving bar 16, and the yarn-carrier transfer mechanism designated generally by 17. I

On each needle bed at the transfer end of the machine, is provided a latchless yarnholding needle 18. Intermediate each holding needle and the knitting needles is located a trimming cutter or plate, shown in Fig. 1, indicated by 19. Yarn-holding members (the construction of which forms the subject matterof the present invention) are provided, one at each side of each holding needle, for clamping and holding the yarn drawn between said members by said needle. hen the yarn is so held by the clamping members and holding needle at either side of the machine at predetermined times as regulated by the pattern mechanism, the adjoining knife will be caused to sever the yarn between the holder and the knitted fabric as explained in said patent. By reason of this mechanism, the yarn which has been dropped from the knitting to be replaced by another of a different characteristic, will be severed. The end passing through the idle carrier will be held and the severed endon the fabric will simply hang loosely and will not draw or pucker the fabric as formerly.

My present invention contemplates the provision of a pair of clamping members designated generally by 21 and 22 for each yarn-holding needle. Each clamping member has an arcuate shank 23 adapted to fit in one of the grooves 11 in a presser hook sector. The inner end of said shank has a recess 24 in its upper edge and the end 25 is curved substantially concentric with the center of the recess. Suitable retaining means is provided adapted by location in said recess, to hold each clamping member in its respective groove. This retaining means in the present instance is provided by making a chisel impression in the top of the Wall 26 transverse to the grooves in which ted lines in Fig. 3, permitting the retainer to enter the recess 24 and by swinging'the clamping member down to the full line position, it will be effectually locked therein against displacement lengthwise in its groove. When the guide bar 14 is positioned over the presser hook sector, the clamping members will be locked in operative position. Upon removal of said bar 14, any of the clamping bars21 may be raised and released from the retaining lugs for re- I moval from the machine.

The extended ends 29 of the clamping members are disposed in juxtaposition to the holding needles,'one at.eac'h' side thereof. Either-needle whenprojected as shown at the left in Fig. 3, is adapted to receive the yarn and when retracted to the position shown at the right in said figure, will draw the yarn between the clamping members, which yieldingly clamp the interposed yarn. By reason of the resiliency of said members, they will accommodate yarns of diiferent diameters. The yarn clamping members may obviously be easily re moved and replaced accordingly, as ,conditions require.

. It is believed that the foregoing conveys a clear understanding of my invention, and while I have illustrated but a single working embodiment, it should be understood that changes mi ht be made in details of construction wit out departing from the spirit and scope of the invention as expressed in the appended claims.

clamping I claim:

1. In a fiat bed knitting machine, the

combination with a presser hook sector,'of

a yarn clamp including a pair of clamping members having arcuate ends detachably supported in grooves in said sector.-

2. In a flat bed knitting machine, the combination with a grooved part, of a yarndevice including a yarn-clamping member having an arcuate end adapted to fit in one of the grooves of said part and having a recess in its end disposed in said groove, and a retaining means adapted tofit in said recess for holding said member against lengthwise displacement therein.

3. In a flat bed" knitting machine, the combination with a grooved part and a yarn-holding needle, of a pair of yarnclamping members adapted to be supported in adjoining grooves in said part with one end extended and straddling said needle, and means holding said clamping members in operative position on said part and permitting quick detachment therefrom.

4. In a flat bed combination with a yarn-holding needle, of a yarn clamping member at each side of said needle adapted for clamping the yarn when it is drawn between said'members by said needle, and means interlocking with said clamping members for holding them in operative position and permitting quick detachment of said members by swinging them to an unlocked position.

5. In a flat bed knitting machine, the combination with a grooved part and a yarn-holding needle, of a pair of yarnclamping members adapted to be supported knitting machine, the

at one end in grooves in'said partand'at the opposite end to straddle each clamping member having said needle, a recess in said supported end, and a retaining means disposed in said recesses for holding the clamping members in operative position and permitting quick detachment of said mem 

